[PATCH v2 07/10] gpio: dw: Return output value when direction is out

[Sean Anderson <seanga2@gmail.com>]

On 6/7/20 9:26 PM, Sean Anderson wrote:
> dm_gpio_ops.get_value can be called when the gpio is either input or
> output. The current dw code always returns the input value, which is
> invalid if the direction is set to out.
> 
> Signed-off-by: Sean Anderson <seanga2@gmail.com>
> ---
> This patch was previously submitted as part of
> https://patchwork.ozlabs.org/project/uboot/list/?series=161576
> 
> Changes in v2:
> - Reorder changes to minimize diff

...and I just noticed that this breaks the build since
dwapb_gpio_get_function is not declared yet. Will revert to the previous
version of this patch in the next revision.

> 
>  drivers/gpio/dwapb_gpio.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/dwapb_gpio.c b/drivers/gpio/dwapb_gpio.c
> index a52c9e18e3..e2970a83a8 100644
> --- a/drivers/gpio/dwapb_gpio.c
> +++ b/drivers/gpio/dwapb_gpio.c
> @@ -69,9 +69,14 @@ static int dwapb_gpio_direction_output(struct udevice *dev, unsigned pin,
>  static int dwapb_gpio_get_value(struct udevice *dev, unsigned pin)
>  {
>  	struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
> -	return !!(readl(plat->base + GPIO_EXT_PORT(plat->bank)) & (1 << pin));
> -}
> +	u32 value;
>  
> +	if (dwapb_gpio_get_function(dev, pin) == GPIOF_OUTPUT)
> +		value = readl(plat->base + GPIO_SWPORT_DR(plat->bank));
> +	else
> +		value = readl(plat->base + GPIO_EXT_PORT(plat->bank));
> +	return !!(value & BIT(pin));
> +}
>  
>  static int dwapb_gpio_set_value(struct udevice *dev, unsigned pin, int val)
>  {
> 

--Sean